import sys

x = int(input())
if x < 30:
  print("No")
else:
  print("Yes") import sys sys x = int(input()) x int(input()) int input() input if x < 30:
  print("No")
else:
  print("Yes") x < 30 x 30 print("No") print "No" print("Yes") print "Yes" x = int(input()) int(input()) x
import sys

x = int(input())
if x < 30:
  print("No")
else:
  print("Yes")
